铁尾矿制备白炭黑的实验研究  

Preparation of Precipitated Silica Powder from Iron Ore Tailing

作　　者：于洪浩[1] 薛向欣[1] 黄大威[1] 

机构地区：[1]东北大学材料与冶金学院硼资源生态化综合利用技术与硼材料重点实验室

出　　处：《过程工程学报》2008年第2期300-304,共5页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:50574030);辽宁省自然科学基金资助项目(编号:20042023)

摘　　要：以铁尾矿和NaOH为原料,利用化学沉淀法成功制备了无定型白炭黑,并研究了制备的工艺条件.用X射线衍射仪、红外光谱仪、扫描电镜、透射电镜和X射线荧光光谱仪对所制白炭黑的物相结构、粒度、形貌和成分进行分析.结果表明,白炭黑中的SiO2纯度为92.3%,化学结构为无定型的水合二氧化硅,形貌近似球状粒子,粒径在150nm以下.白炭黑的比表面积(BET)为108m2/g,10%悬浮液中pH值为5.5～6.0,加热减量为5.42%,1000℃灼烧减量为6.16%.产品符合中国行业标准HG/T3061-1999的要求。The preparation of precipitated silica particles via chemical precipitation using iron ore tailing and sodium hydroxide as raw materials was successfully demonstrated. The experimental conditions for synthesizing precipitated silica particles were examined in detail. The phase composition, morphology and structure of the synthesized particles were characterized by X-ray diffraction （XRD）, FT-IR spectrometry, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and X-ray fluorescence analysis. The SiO2 purity in the precipitated silica product was 92.3%, determined by X-ray fluorescence analysis. The chemical structure of precipitated silica was hydrated silicon oxide through FT-IR analysis. The structure of precipitated silica was amorphous by XRD analysis. The SEM and TEM miorographs showed that the shape of precipitated silica particles was nearly spherical, and their average grain diameter less than 150 nm. The measured results of chemical and physical properties of precipitated silica powder were obtained as followed： the specific surface area was 108 m^2/g, pH in the 10% suspending liquid 5.5-6.0, and loss on ignition at 1000℃ was 6.16%. The product could be comparable with the requirements of HG/T 3061-1999 industrial product standard.

关 键 词：铁尾矿 碱处理 白炭黑 化学沉淀 

分 类 号：TB321[一般工业技术—材料科学与工程]